package app

import (
	"context"
	"log"
	"os"
	"os/signal"
	"syscall"
	"time"
)

// App represents the main application orchestrator
// It manages the lifecycle and dependencies of all core components
// (job manager, cluster manager, dispatcher, status collector, etc.)
type App struct {
	ctx    context.Context
	cancel context.CancelFunc
	// Add fields for core components as needed
}

// NewApp creates and initializes the application
func NewApp() *App {
	ctx, cancel := context.WithCancel(context.Background())
	return &App{
		ctx:    ctx,
		cancel: cancel,
	}
}

// Init initializes all core components and dependencies
func (a *App) Init() error {
	// TODO: Initialize config, database, job manager, cluster manager, etc.
	log.Println("Initializing application components...")
	return nil
}

// Start runs the application and all components
func (a *App) Start() error {
	log.Println("Starting application...")
	// TODO: Start all core components (job manager, dispatcher, etc.)
	return nil
}

// Run runs the application with signal handling for graceful shutdown
func (a *App) Run() {
	if err := a.Init(); err != nil {
		log.Fatalf("Failed to initialize app: %v", err)
	}
	if err := a.Start(); err != nil {
		log.Fatalf("Failed to start app: %v", err)
	}

	// Signal handling for graceful shutdown
	sigs := make(chan os.Signal, 1)
	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
	log.Println("Application is running. Press Ctrl+C to exit.")
	<-sigs
	log.Println("Shutdown signal received. Stopping application...")
	a.Stop()
}

// Stop gracefully stops all components and cleans up resources
func (a *App) Stop() {
	log.Println("Stopping application components...")
	a.cancel()
	// TODO: Stop all core components and clean up
	log.Println("Application stopped.")
}

// HealthCheck returns the health status of the application
func (a *App) HealthCheck() bool {
	// TODO: Aggregate health from all components
	return true
}

// Metrics collects and returns application metrics
func (a *App) Metrics() map[string]interface{} {
	// TODO: Collect metrics from all components
	return map[string]interface{}{
		"uptime": time.Since(time.Now()),
	}
}
